Making Superior Quality Weapons?

Just a quick question. I can’t figure out how the obstacle for making a weapon (e.g. a sword) changes if you want to make it superior quality (e.g. making a long sword vs. making a short sword).

I don’t want to be annoying but it’s just a small question and the answer would really help my game.

It depends slightly on the skill, and is described under the skill. With weaponsmith, for example, it’s +2 Ob. With blacksmith I’d say you can’t; simple weapons are about all you can pull off.

OK, thanks!